UPDATE: Problem "solved". This time I put nearly everything in there was (except those items from the bonus mission) and left the studio via "save and exit". Pling! Got the achievement.
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This achievement just doesn't work for me.
I found in the developer's forum this thread. In it it is said

Quote:

The mega-collage requires you to use one item from every doodle, including the bonus doodle. [CORRECTION: excluding the bonus doodle]

So I took from all of the 24 main campaign doodles exactly one item and put them in my doodle. It didn't work.
Then I took from every doodle exactly one item without leaving the studio or saving. It didn't work.
What do I have to do to get that achievement? Is there any sequence to follow? Does it have to be a functioning doodle with bugs and a honey pot? Does the honey pot count towards the required items? Is there any restriction for only using one item from every doodle at all?